Study On Prestress Setting And Temperature Changes’ Effect On The Suspendome

Suspend-dome is a new kind of hybrid space structural system which is formed byKawaguchi Mamoru etc.It’s made up of single-layer dome and flexible tensegritysystem. As a prestressing steel structure,the value and distribution of its prestress hasgreat influence on the static, dynamic and stable performance.Thus,looking for asimple,general solution of pretension is an urgent task.Suspendome belong to the scopeof prestressed steel structure,thus the cable must keep a certain prestress level duringnormal use.The temperature variation will cause a lot of internal forces and deformationin the structure.And,such structural effects will be a significant impact on themechanical properties.However, the research of this aspect in the large span domestructure is still very scarce.This paper takes a large-span suspendome as research object.This paper useANSYS(large general-purpose finite element analysis software) as a tool to carry outthe modeling of the structure and detailedly describe the setting of the prestressed. Inorder to maintain the working stages prestress level of the structure,this paper carry outa thorough study of the temperature effect in the use phase of the suspendome structureby considerring seasonal temperature difference.Focusing on the view of thetemperature variation,the systematic study was conducted on the static performance,theeigenvalue buckling,material nonlinear buckling,double nonlinear buckling stableperformance influence of the suspendome structure when temperature changes.Drawsome meaningful conclusions by analyzing:1. Rigid cable method and the improved tension compensation method to solvethe prestressed value,are especially suitable for large span interval Tendon Dispositionsuspendome structure; 2．After logic analysis,the detailed steps and each step of the method that use therigid method to solve prestress can be obtained.When adopts rigid cable to setprestression,we should increase the nodal loads on pretensioned by partial adjustmenttaking into account the relatively small inner prestression value;3．Under the temperature change in season,the nonlinear performance of thesuspendome structure is not obvious;As the temperature increases, the pretension of thecable lose seriously under the use phase.4．Considering material elastic-plastic whether or not,it has a great impact on thestructure stable bearing capacity.Especially,when the temperature gets higher,it has moreoutstanding impact.5. With increasing temperature,bearing capacity drop when initial defect islarge,otherwise the opposite.Finally,summarize the result of this paper,put forward some suspendome structureto be further studied related problems,and forecast this project study.